Why do rats dwell in our drainage system?
The drainage system carries all food that is washed off your plate. It does not carry only yours but all your neighbours, thus providing plenty of food for the rats. Not only this, but the drainage system also consists of flushed warm water from your bathroom. Along with this, there are also various types of insects in the drainage system: spiders and worms, rats being omnivores, also feed on them. Drainage is meant as heaven for rats, where they have proper food and shelter.
Water is also important because they are great swimmers who can catch prey and travel long distances. The drainage is dark and isolated, favouring the rats because they rely on their sense of smell and don’t like company.